package com.bjsxt.math;

import java.util.Random;

class testMath {
    public static void main(String[] args) {
        System.out.println(Math.ceil(2.1));
        System.out.println(Math.floor(2.9));
        System.out.println(Math.E);
        System.out.println(Math.PI);

        Random rand = new Random();
        System.out.println(rand.nextDouble());
    }
}
